What is CVE-2020-7796?

CVE-2020-7796 is a critical-severity vulnerability in Synacor Zimbra_collaboration_suite, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2020-02-18.

How severe is CVE-2020-7796?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-7796 known to be exploited?

Yes. CVE-2020-7796 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-02-17), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.

SSRF in Synacor Zimbra_collaboration_suite

CVE-2020-7796

Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.846 (99.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Synacor Zimbra_collaboration_suite — versions 8.8.15
N/a — versions n/a

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-02-17. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-03-10.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Public proof-of-concept exploits

References

cve@mitre.org (x_refsource_CONFIRM, Release Notes, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2020-7796?: CVE-2020-7796 is a critical-severity vulnerability in Synacor Zimbra_collaboration_suite, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2020-02-18.
How severe is CVE-2020-7796?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-7796 known to be exploited?: Yes. CVE-2020-7796 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-02-17), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.